c# - byte array to png file [duplicate]

Question

In my code I load a 32-bit-depth PNG file (1 pixel 4 byte) into a byte array like this:

//Pick a file
OpenFileDialog FileValaszto = new OpenFileDialog();
FileValaszto.ShowDialog();

//Create BitmapImage
BeolvasottKep = new BitmapImage(new Uri(FileValaszto.FileName));

//Create byte array
stride = BeolvasottKep.PixelWidth * 4;
int size = BeolvasottKep.PixelHeight * stride;
MyPixelsArray = new byte[size];
BeolvasottKep.CopyPixels(pixels, stride, 0);

After I finish manipulating the pixels in "MyPixelsArray" I would like to save its data back into a new PNG image file. Only I can't...

I spent more than a day searching the net but there is no solution to this exact problem. Any help would be highly appreciated. Thanks!

If you are trying to resize your image, this link maybe helps you stackoverflow.com/questions/1922040/resize-an-image-c-sharp — Rumpelstinsk
– Rumpelstinsk, Commented Oct 7, 2016 at 8:46
What I want to achieve: 1,Load a PNG file into a bytearray (done) 2, Manipulate this byte array thus changing the picture (done) 3, Save this byte array back into a PNG file on the harddrive. (NOT done, hence the question) — Truckerguy
– Truckerguy, Commented Oct 7, 2016 at 8:59
Edit your question and add why you can't. Is it throwing any exception? Does it not compile? Is the result PNG wrong? — Pikoh
– Pikoh, Commented Oct 7, 2016 at 9:55

Manish Singh · Accepted Answer · 2016-10-08 10:45:05Z

0

Not tested but might work. Try it i hope it help you

 //Pick a file
        OpenFileDialog FileValaszto = new OpenFileDialog();
         FileValaszto .ShowDialog();

        //Create BitmapImage
        BeolvasottKep = new BitmapImage(new Uri(FileValaszto.FileName));

        //Create byte array
        stride = BeolvasottKep.PixelWidth * 4;
        int size = BeolvasottKep.PixelHeight * stride;

        MemoryStream ms = new System.IO.MemoryStream(stride);
        Image i = Image.FromStream(ms);

edited Oct 8, 2016 at 10:45

Manish Singh

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answered Oct 7, 2016 at 8:53

Metallic Skeleton

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3 Comments

kevinc Over a year ago

Then do i.Save('filepath', System.Drawing.Imaging.ImageFormat.png);

Truckerguy Over a year ago

Thank you all for your kind help!!! Problem is solved.

Metallic Skeleton Over a year ago

Hi Broadroad, Could you please mention how you solved? Thanks.

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